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-rw-r--r--fs/ceph/inode.c1620
-rw-r--r--fs/ceph/xattr.c833
2 files changed, 2453 insertions, 0 deletions
diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
new file mode 100644
index 000000000000..6097af790047
--- /dev/null
+++ b/fs/ceph/inode.c
@@ -0,0 +1,1620 @@
1#include "ceph_debug.h"
2
3#include <linux/module.h>
4#include <linux/fs.h>
5#include <linux/smp_lock.h>
6#include <linux/slab.h>
7#include <linux/string.h>
8#include <linux/uaccess.h>
9#include <linux/kernel.h>
10#include <linux/namei.h>
11#include <linux/writeback.h>
12#include <linux/vmalloc.h>
13
14#include "super.h"
15#include "decode.h"
16
17/*
18 * Ceph inode operations
19 *
20 * Implement basic inode helpers (get, alloc) and inode ops (getattr,
21 * setattr, etc.), xattr helpers, and helpers for assimilating
22 * metadata returned by the MDS into our cache.
23 *
24 * Also define helpers for doing asynchronous writeback, invalidation,
25 * and truncation for the benefit of those who can't afford to block
26 * (typically because they are in the message handler path).
27 */
28
29static const struct inode_operations ceph_symlink_iops;
30
31static void ceph_inode_invalidate_pages(struct work_struct *work);
32
33/*
34 * find or create an inode, given the ceph ino number
35 */
36struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
37{
38 struct inode *inode;
39 ino_t t = ceph_vino_to_ino(vino);
40
41 inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
42 if (inode == NULL)
43 return ERR_PTR(-ENOMEM);
44 if (inode->i_state & I_NEW) {
45 dout("get_inode created new inode %p %llx.%llx ino %llx\n",
46 inode, ceph_vinop(inode), (u64)inode->i_ino);
47 unlock_new_inode(inode);
48 }
49
50 dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
51 vino.snap, inode);
52 return inode;
53}
54
55/*
56 * get/constuct snapdir inode for a given directory
57 */
58struct inode *ceph_get_snapdir(struct inode *parent)
59{
60 struct ceph_vino vino = {
61 .ino = ceph_ino(parent),
62 .snap = CEPH_SNAPDIR,
63 };
64 struct inode *inode = ceph_get_inode(parent->i_sb, vino);
65
66 BUG_ON(!S_ISDIR(parent->i_mode));
67 if (IS_ERR(inode))
68 return ERR_PTR(PTR_ERR(inode));
69 inode->i_mode = parent->i_mode;
70 inode->i_uid = parent->i_uid;
71 inode->i_gid = parent->i_gid;
72 inode->i_op = &ceph_dir_iops;
73 inode->i_fop = &ceph_dir_fops;
74 ceph_inode(inode)->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
75 return inode;
76}
77
78const struct inode_operations ceph_file_iops = {
79 .permission = ceph_permission,
80 .setattr = ceph_setattr,
81 .getattr = ceph_getattr,
82 .setxattr = ceph_setxattr,
83 .getxattr = ceph_getxattr,
84 .listxattr = ceph_listxattr,
85 .removexattr = ceph_removexattr,
86};
87
88
89/*
90 * We use a 'frag tree' to keep track of the MDS's directory fragments
91 * for a given inode (usually there is just a single fragment). We
92 * need to know when a child frag is delegated to a new MDS, or when
93 * it is flagged as replicated, so we can direct our requests
94 * accordingly.
95 */
96
97/*
98 * find/create a frag in the tree
99 */
100static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
101 u32 f)
102{
103 struct rb_node **p;
104 struct rb_node *parent = NULL;
105 struct ceph_inode_frag *frag;
106 int c;
107
108 p = &ci->i_fragtree.rb_node;
109 while (*p) {
110 parent = *p;
111 frag = rb_entry(parent, struct ceph_inode_frag, node);
112 c = ceph_frag_compare(f, frag->frag);
113 if (c < 0)
114 p = &(*p)->rb_left;
115 else if (c > 0)
116 p = &(*p)->rb_right;
117 else
118 return frag;
119 }
120
121 frag = kmalloc(sizeof(*frag), GFP_NOFS);
122 if (!frag) {
123 pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx "
124 "frag %x\n", &ci->vfs_inode,
125 ceph_vinop(&ci->vfs_inode), f);
126 return ERR_PTR(-ENOMEM);
127 }
128 frag->frag = f;
129 frag->split_by = 0;
130 frag->mds = -1;
131 frag->ndist = 0;
132
133 rb_link_node(&frag->node, parent, p);
134 rb_insert_color(&frag->node, &ci->i_fragtree);
135
136 dout("get_or_create_frag added %llx.%llx frag %x\n",
137 ceph_vinop(&ci->vfs_inode), f);
138 return frag;
139}
140
141/*
142 * find a specific frag @f
143 */
144struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
145{
146 struct rb_node *n = ci->i_fragtree.rb_node;
147
148 while (n) {
149 struct ceph_inode_frag *frag =
150 rb_entry(n, struct ceph_inode_frag, node);
151 int c = ceph_frag_compare(f, frag->frag);
152 if (c < 0)
153 n = n->rb_left;
154 else if (c > 0)
155 n = n->rb_right;
156 else
157 return frag;
158 }
159 return NULL;
160}
161
162/*
163 * Choose frag containing the given value @v. If @pfrag is
164 * specified, copy the frag delegation info to the caller if
165 * it is present.
166 */
167u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
168 struct ceph_inode_frag *pfrag,
169 int *found)
170{
171 u32 t = ceph_frag_make(0, 0);
172 struct ceph_inode_frag *frag;
173 unsigned nway, i;
174 u32 n;
175
176 if (found)
177 *found = 0;
178
179 mutex_lock(&ci->i_fragtree_mutex);
180 while (1) {
181 WARN_ON(!ceph_frag_contains_value(t, v));
182 frag = __ceph_find_frag(ci, t);
183 if (!frag)
184 break; /* t is a leaf */
185 if (frag->split_by == 0) {
186 if (pfrag)
187 memcpy(pfrag, frag, sizeof(*pfrag));
188 if (found)
189 *found = 1;
190 break;
191 }
192
193 /* choose child */
194 nway = 1 << frag->split_by;
195 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
196 frag->split_by, nway);
197 for (i = 0; i < nway; i++) {
198 n = ceph_frag_make_child(t, frag->split_by, i);
199 if (ceph_frag_contains_value(n, v)) {
200 t = n;
201 break;
202 }
203 }
204 BUG_ON(i == nway);
205 }
206 dout("choose_frag(%x) = %x\n", v, t);
207
208 mutex_unlock(&ci->i_fragtree_mutex);
209 return t;
210}
211
212/*
213 * Process dirfrag (delegation) info from the mds. Include leaf
214 * fragment in tree ONLY if ndist > 0. Otherwise, only
215 * branches/splits are included in i_fragtree)
216 */
217static int ceph_fill_dirfrag(struct inode *inode,
218 struct ceph_mds_reply_dirfrag *dirinfo)
219{
220 struct ceph_inode_info *ci = ceph_inode(inode);
221 struct ceph_inode_frag *frag;
222 u32 id = le32_to_cpu(dirinfo->frag);
223 int mds = le32_to_cpu(dirinfo->auth);
224 int ndist = le32_to_cpu(dirinfo->ndist);
225 int i;
226 int err = 0;
227
228 mutex_lock(&ci->i_fragtree_mutex);
229 if (ndist == 0) {
230 /* no delegation info needed. */
231 frag = __ceph_find_frag(ci, id);
232 if (!frag)
233 goto out;
234 if (frag->split_by == 0) {
235 /* tree leaf, remove */
236 dout("fill_dirfrag removed %llx.%llx frag %x"
237 " (no ref)\n", ceph_vinop(inode), id);
238 rb_erase(&frag->node, &ci->i_fragtree);
239 kfree(frag);
240 } else {
241 /* tree branch, keep and clear */
242 dout("fill_dirfrag cleared %llx.%llx frag %x"
243 " referral\n", ceph_vinop(inode), id);
244 frag->mds = -1;
245 frag->ndist = 0;
246 }
247 goto out;
248 }
249
250
251 /* find/add this frag to store mds delegation info */
252 frag = __get_or_create_frag(ci, id);
253 if (IS_ERR(frag)) {
254 /* this is not the end of the world; we can continue
255 with bad/inaccurate delegation info */
256 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
257 ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
258 err = -ENOMEM;
259 goto out;
260 }
261
262 frag->mds = mds;
263 frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
264 for (i = 0; i < frag->ndist; i++)
265 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
266 dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
267 ceph_vinop(inode), frag->frag, frag->ndist);
268
269out:
270 mutex_unlock(&ci->i_fragtree_mutex);
271 return err;
272}
273
274
275/*
276 * initialize a newly allocated inode.
277 */
278struct inode *ceph_alloc_inode(struct super_block *sb)
279{
280 struct ceph_inode_info *ci;
281 int i;
282
283 ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
284 if (!ci)
285 return NULL;
286
287 dout("alloc_inode %p\n", &ci->vfs_inode);
288
289 ci->i_version = 0;
290 ci->i_time_warp_seq = 0;
291 ci->i_ceph_flags = 0;
292 ci->i_release_count = 0;
293 ci->i_symlink = NULL;
294
295 ci->i_fragtree = RB_ROOT;
296 mutex_init(&ci->i_fragtree_mutex);
297
298 ci->i_xattrs.blob = NULL;
299 ci->i_xattrs.prealloc_blob = NULL;
300 ci->i_xattrs.dirty = false;
301 ci->i_xattrs.index = RB_ROOT;
302 ci->i_xattrs.count = 0;
303 ci->i_xattrs.names_size = 0;
304 ci->i_xattrs.vals_size = 0;
305 ci->i_xattrs.version = 0;
306 ci->i_xattrs.index_version = 0;
307
308 ci->i_caps = RB_ROOT;
309 ci->i_auth_cap = NULL;
310 ci->i_dirty_caps = 0;
311 ci->i_flushing_caps = 0;
312 INIT_LIST_HEAD(&ci->i_dirty_item);
313 INIT_LIST_HEAD(&ci->i_flushing_item);
314 ci->i_cap_flush_seq = 0;
315 ci->i_cap_flush_last_tid = 0;
316 memset(&ci->i_cap_flush_tid, 0, sizeof(ci->i_cap_flush_tid));
317 init_waitqueue_head(&ci->i_cap_wq);
318 ci->i_hold_caps_min = 0;
319 ci->i_hold_caps_max = 0;
320 INIT_LIST_HEAD(&ci->i_cap_delay_list);
321 ci->i_cap_exporting_mds = 0;
322 ci->i_cap_exporting_mseq = 0;
323 ci->i_cap_exporting_issued = 0;
324 INIT_LIST_HEAD(&ci->i_cap_snaps);
325 ci->i_head_snapc = NULL;
326 ci->i_snap_caps = 0;
327
328 for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
329 ci->i_nr_by_mode[i] = 0;
330
331 ci->i_truncate_seq = 0;
332 ci->i_truncate_size = 0;
333 ci->i_truncate_pending = 0;
334
335 ci->i_max_size = 0;
336 ci->i_reported_size = 0;
337 ci->i_wanted_max_size = 0;
338 ci->i_requested_max_size = 0;
339
340 ci->i_pin_ref = 0;
341 ci->i_rd_ref = 0;
342 ci->i_rdcache_ref = 0;
343 ci->i_wr_ref = 0;
344 ci->i_wrbuffer_ref = 0;
345 ci->i_wrbuffer_ref_head = 0;
346 ci->i_shared_gen = 0;
347 ci->i_rdcache_gen = 0;
348 ci->i_rdcache_revoking = 0;
349
350 INIT_LIST_HEAD(&ci->i_unsafe_writes);
351 INIT_LIST_HEAD(&ci->i_unsafe_dirops);
352 spin_lock_init(&ci->i_unsafe_lock);
353
354 ci->i_snap_realm = NULL;
355 INIT_LIST_HEAD(&ci->i_snap_realm_item);
356 INIT_LIST_HEAD(&ci->i_snap_flush_item);
357
358 INIT_WORK(&ci->i_wb_work, ceph_inode_writeback);
359 INIT_WORK(&ci->i_pg_inv_work, ceph_inode_invalidate_pages);
360
361 INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
362
363 return &ci->vfs_inode;
364}
365
366void ceph_destroy_inode(struct inode *inode)
367{
368 struct ceph_inode_info *ci = ceph_inode(inode);
369 struct ceph_inode_frag *frag;
370 struct rb_node *n;
371
372 dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
373
374 ceph_queue_caps_release(inode);
375
376 kfree(ci->i_symlink);
377 while ((n = rb_first(&ci->i_fragtree)) != NULL) {
378 frag = rb_entry(n, struct ceph_inode_frag, node);
379 rb_erase(n, &ci->i_fragtree);
380 kfree(frag);
381 }
382
383 __ceph_destroy_xattrs(ci);
384 ceph_buffer_put(ci->i_xattrs.blob);
385 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
386
387 kmem_cache_free(ceph_inode_cachep, ci);
388}
389
390
391/*
392 * Helpers to fill in size, ctime, mtime, and atime. We have to be
393 * careful because either the client or MDS may have more up to date
394 * info, depending on which capabilities are held, and whether
395 * time_warp_seq or truncate_seq have increased. (Ordinarily, mtime
396 * and size are monotonically increasing, except when utimes() or
397 * truncate() increments the corresponding _seq values.)
398 */
399int ceph_fill_file_size(struct inode *inode, int issued,
400 u32 truncate_seq, u64 truncate_size, u64 size)
401{
402 struct ceph_inode_info *ci = ceph_inode(inode);
403 int queue_trunc = 0;
404
405 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
406 (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
407 dout("size %lld -> %llu\n", inode->i_size, size);
408 inode->i_size = size;
409 inode->i_blocks = (size + (1<<9) - 1) >> 9;
410 ci->i_reported_size = size;
411 if (truncate_seq != ci->i_truncate_seq) {
412 dout("truncate_seq %u -> %u\n",
413 ci->i_truncate_seq, truncate_seq);
414 ci->i_truncate_seq = truncate_seq;
415 if (issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_RD|
416 CEPH_CAP_FILE_WR|CEPH_CAP_FILE_BUFFER|
417 CEPH_CAP_FILE_EXCL)) {
418 ci->i_truncate_pending++;
419 queue_trunc = 1;
420 }
421 }
422 }
423 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
424 ci->i_truncate_size != truncate_size) {
425 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
426 truncate_size);
427 ci->i_truncate_size = truncate_size;
428 }
429 return queue_trunc;
430}
431
432void ceph_fill_file_time(struct inode *inode, int issued,
433 u64 time_warp_seq, struct timespec *ctime,
434 struct timespec *mtime, struct timespec *atime)
435{
436 struct ceph_inode_info *ci = ceph_inode(inode);
437 int warn = 0;
438
439 if (issued & (CEPH_CAP_FILE_EXCL|
440 CEPH_CAP_FILE_WR|
441 CEPH_CAP_FILE_BUFFER)) {
442 if (timespec_compare(ctime, &inode->i_ctime) > 0) {
443 dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
444 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
445 ctime->tv_sec, ctime->tv_nsec);
446 inode->i_ctime = *ctime;
447 }
448 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
449 /* the MDS did a utimes() */
450 dout("mtime %ld.%09ld -> %ld.%09ld "
451 "tw %d -> %d\n",
452 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
453 mtime->tv_sec, mtime->tv_nsec,
454 ci->i_time_warp_seq, (int)time_warp_seq);
455
456 inode->i_mtime = *mtime;
457 inode->i_atime = *atime;
458 ci->i_time_warp_seq = time_warp_seq;
459 } else if (time_warp_seq == ci->i_time_warp_seq) {
460 /* nobody did utimes(); take the max */
461 if (timespec_compare(mtime, &inode->i_mtime) > 0) {
462 dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
463 inode->i_mtime.tv_sec,
464 inode->i_mtime.tv_nsec,
465 mtime->tv_sec, mtime->tv_nsec);
466 inode->i_mtime = *mtime;
467 }
468 if (timespec_compare(atime, &inode->i_atime) > 0) {
469 dout("atime %ld.%09ld -> %ld.%09ld inc\n",
470 inode->i_atime.tv_sec,
471 inode->i_atime.tv_nsec,
472 atime->tv_sec, atime->tv_nsec);
473 inode->i_atime = *atime;
474 }
475 } else if (issued & CEPH_CAP_FILE_EXCL) {
476 /* we did a utimes(); ignore mds values */
477 } else {
478 warn = 1;
479 }
480 } else {
481 /* we have no write caps; whatever the MDS says is true */
482 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
483 inode->i_ctime = *ctime;
484 inode->i_mtime = *mtime;
485 inode->i_atime = *atime;
486 ci->i_time_warp_seq = time_warp_seq;
487 } else {
488 warn = 1;
489 }
490 }
491 if (warn) /* time_warp_seq shouldn't go backwards */
492 dout("%p mds time_warp_seq %llu < %u\n",
493 inode, time_warp_seq, ci->i_time_warp_seq);
494}
495
496/*
497 * Populate an inode based on info from mds. May be called on new or
498 * existing inodes.
499 */
500static int fill_inode(struct inode *inode,
501 struct ceph_mds_reply_info_in *iinfo,
502 struct ceph_mds_reply_dirfrag *dirinfo,
503 struct ceph_mds_session *session,
504 unsigned long ttl_from, int cap_fmode,
505 struct ceph_cap_reservation *caps_reservation)
506{
507 struct ceph_mds_reply_inode *info = iinfo->in;
508 struct ceph_inode_info *ci = ceph_inode(inode);
509 int i;
510 int issued, implemented;
511 struct timespec mtime, atime, ctime;
512 u32 nsplits;
513 struct ceph_buffer *xattr_blob = NULL;
514 int err = 0;
515 int queue_trunc = 0;
516
517 dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
518 inode, ceph_vinop(inode), le64_to_cpu(info->version),
519 ci->i_version);
520
521 /*
522 * prealloc xattr data, if it looks like we'll need it. only
523 * if len > 4 (meaning there are actually xattrs; the first 4
524 * bytes are the xattr count).
525 */
526 if (iinfo->xattr_len > 4) {
527 xattr_blob = ceph_buffer_new_alloc(iinfo->xattr_len, GFP_NOFS);
528 if (!xattr_blob)
529 pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
530 iinfo->xattr_len);
531 }
532
533 spin_lock(&inode->i_lock);
534
535 /*
536 * provided version will be odd if inode value is projected,
537 * even if stable. skip the update if we have a newer info
538 * (e.g., due to inode info racing form multiple MDSs), or if
539 * we are getting projected (unstable) inode info.
540 */
541 if (le64_to_cpu(info->version) > 0 &&
542 (ci->i_version & ~1) > le64_to_cpu(info->version))
543 goto no_change;
544
545 issued = __ceph_caps_issued(ci, &implemented);
546 issued |= implemented | __ceph_caps_dirty(ci);
547
548 /* update inode */
549 ci->i_version = le64_to_cpu(info->version);
550 inode->i_version++;
551 inode->i_rdev = le32_to_cpu(info->rdev);
552
553 if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
554 inode->i_mode = le32_to_cpu(info->mode);
555 inode->i_uid = le32_to_cpu(info->uid);
556 inode->i_gid = le32_to_cpu(info->gid);
557 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
558 inode->i_uid, inode->i_gid);
559 }
560
561 if ((issued & CEPH_CAP_LINK_EXCL) == 0)
562 inode->i_nlink = le32_to_cpu(info->nlink);
563
564 /* be careful with mtime, atime, size */
565 ceph_decode_timespec(&atime, &info->atime);
566 ceph_decode_timespec(&mtime, &info->mtime);
567 ceph_decode_timespec(&ctime, &info->ctime);
568 queue_trunc = ceph_fill_file_size(inode, issued,
569 le32_to_cpu(info->truncate_seq),
570 le64_to_cpu(info->truncate_size),
571 S_ISDIR(inode->i_mode) ?
572 ci->i_rbytes :
573 le64_to_cpu(info->size));
574 ceph_fill_file_time(inode, issued,
575 le32_to_cpu(info->time_warp_seq),
576 &ctime, &mtime, &atime);
577
578 ci->i_max_size = le64_to_cpu(info->max_size);
579 ci->i_layout = info->layout;
580 inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
581
582 /* xattrs */
583 /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
584 if ((issued & CEPH_CAP_XATTR_EXCL) == 0 &&
585 le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
586 if (ci->i_xattrs.blob)
587 ceph_buffer_put(ci->i_xattrs.blob);
588 ci->i_xattrs.blob = xattr_blob;
589 if (xattr_blob)
590 memcpy(ci->i_xattrs.blob->vec.iov_base,
591 iinfo->xattr_data, iinfo->xattr_len);
592 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
593 }
594
595 inode->i_mapping->a_ops = &ceph_aops;
596 inode->i_mapping->backing_dev_info =
597 &ceph_client(inode->i_sb)->backing_dev_info;
598
599 switch (inode->i_mode & S_IFMT) {
600 case S_IFIFO:
601 case S_IFBLK:
602 case S_IFCHR:
603 case S_IFSOCK:
604 init_special_inode(inode, inode->i_mode, inode->i_rdev);
605 inode->i_op = &ceph_file_iops;
606 break;
607 case S_IFREG:
608 inode->i_op = &ceph_file_iops;
609 inode->i_fop = &ceph_file_fops;
610 break;
611 case S_IFLNK:
612 inode->i_op = &ceph_symlink_iops;
613 if (!ci->i_symlink) {
614 int symlen = iinfo->symlink_len;
615 char *sym;
616
617 BUG_ON(symlen != inode->i_size);
618 spin_unlock(&inode->i_lock);
619
620 err = -ENOMEM;
621 sym = kmalloc(symlen+1, GFP_NOFS);
622 if (!sym)
623 goto out;
624 memcpy(sym, iinfo->symlink, symlen);
625 sym[symlen] = 0;
626
627 spin_lock(&inode->i_lock);
628 if (!ci->i_symlink)
629 ci->i_symlink = sym;
630 else
631 kfree(sym); /* lost a race */
632 }
633 break;
634 case S_IFDIR:
635 inode->i_op = &ceph_dir_iops;
636 inode->i_fop = &ceph_dir_fops;
637
638 ci->i_files = le64_to_cpu(info->files);
639 ci->i_subdirs = le64_to_cpu(info->subdirs);
640 ci->i_rbytes = le64_to_cpu(info->rbytes);
641 ci->i_rfiles = le64_to_cpu(info->rfiles);
642 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
643 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
644
645 /* set dir completion flag? */
646 if (ci->i_files == 0 && ci->i_subdirs == 0 &&
647 ceph_snap(inode) == CEPH_NOSNAP &&
648 (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED)) {
649 dout(" marking %p complete (empty)\n", inode);
650 ci->i_ceph_flags |= CEPH_I_COMPLETE;
651 ci->i_max_offset = 2;
652 }
653
654 /* it may be better to set st_size in getattr instead? */
655 if (ceph_test_opt(ceph_client(inode->i_sb), RBYTES))
656 inode->i_size = ci->i_rbytes;
657 break;
658 default:
659 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
660 ceph_vinop(inode), inode->i_mode);
661 }
662
663no_change:
664 spin_unlock(&inode->i_lock);
665
666 /* queue truncate if we saw i_size decrease */
667 if (queue_trunc)
668 if (queue_work(ceph_client(inode->i_sb)->trunc_wq,
669 &ci->i_vmtruncate_work))
670 igrab(inode);
671
672 /* populate frag tree */
673 /* FIXME: move me up, if/when version reflects fragtree changes */
674 nsplits = le32_to_cpu(info->fragtree.nsplits);
675 mutex_lock(&ci->i_fragtree_mutex);
676 for (i = 0; i < nsplits; i++) {
677 u32 id = le32_to_cpu(info->fragtree.splits[i].frag);
678 struct ceph_inode_frag *frag = __get_or_create_frag(ci, id);
679
680 if (IS_ERR(frag))
681 continue;
682 frag->split_by = le32_to_cpu(info->fragtree.splits[i].by);
683 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
684 }
685 mutex_unlock(&ci->i_fragtree_mutex);
686
687 /* were we issued a capability? */
688 if (info->cap.caps) {
689 if (ceph_snap(inode) == CEPH_NOSNAP) {
690 ceph_add_cap(inode, session,
691 le64_to_cpu(info->cap.cap_id),
692 cap_fmode,
693 le32_to_cpu(info->cap.caps),
694 le32_to_cpu(info->cap.wanted),
695 le32_to_cpu(info->cap.seq),
696 le32_to_cpu(info->cap.mseq),
697 le64_to_cpu(info->cap.realm),
698 info->cap.flags,
699 caps_reservation);
700 } else {
701 spin_lock(&inode->i_lock);
702 dout(" %p got snap_caps %s\n", inode,
703 ceph_cap_string(le32_to_cpu(info->cap.caps)));
704 ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
705 if (cap_fmode >= 0)
706 __ceph_get_fmode(ci, cap_fmode);
707 spin_unlock(&inode->i_lock);
708 }
709 }
710
711 /* update delegation info? */
712 if (dirinfo)
713 ceph_fill_dirfrag(inode, dirinfo);
714
715 err = 0;
716
717out:
718 ceph_buffer_put(xattr_blob);
719 return err;
720}
721
722/*
723 * caller should hold session s_mutex.
724 */
725static void update_dentry_lease(struct dentry *dentry,
726 struct ceph_mds_reply_lease *lease,
727 struct ceph_mds_session *session,
728 unsigned long from_time)
729{
730 struct ceph_dentry_info *di = ceph_dentry(dentry);
731 long unsigned duration = le32_to_cpu(lease->duration_ms);
732 long unsigned ttl = from_time + (duration * HZ) / 1000;
733 long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
734 struct inode *dir;
735
736 /* only track leases on regular dentries */
737 if (dentry->d_op != &ceph_dentry_ops)
738 return;
739
740 spin_lock(&dentry->d_lock);
741 dout("update_dentry_lease %p mask %d duration %lu ms ttl %lu\n",
742 dentry, le16_to_cpu(lease->mask), duration, ttl);
743
744 /* make lease_rdcache_gen match directory */
745 dir = dentry->d_parent->d_inode;
746 di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
747
748 if (lease->mask == 0)
749 goto out_unlock;
750
751 if (di->lease_gen == session->s_cap_gen &&
752 time_before(ttl, dentry->d_time))
753 goto out_unlock; /* we already have a newer lease. */
754
755 if (di->lease_session && di->lease_session != session)
756 goto out_unlock;
757
758 ceph_dentry_lru_touch(dentry);
759
760 if (!di->lease_session)
761 di->lease_session = ceph_get_mds_session(session);
762 di->lease_gen = session->s_cap_gen;
763 di->lease_seq = le32_to_cpu(lease->seq);
764 di->lease_renew_after = half_ttl;
765 di->lease_renew_from = 0;
766 dentry->d_time = ttl;
767out_unlock:
768 spin_unlock(&dentry->d_lock);
769 return;
770}
771
772/*
773 * splice a dentry to an inode.
774 * caller must hold directory i_mutex for this to be safe.
775 *
776 * we will only rehash the resulting dentry if @prehash is
777 * true; @prehash will be set to false (for the benefit of
778 * the caller) if we fail.
779 */
780static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
781 bool *prehash)
782{
783 struct dentry *realdn;
784
785 /* dn must be unhashed */
786 if (!d_unhashed(dn))
787 d_drop(dn);
788 realdn = d_materialise_unique(dn, in);
789 if (IS_ERR(realdn)) {
790 pr_err("splice_dentry error %p inode %p ino %llx.%llx\n",
791 dn, in, ceph_vinop(in));
792 if (prehash)
793 *prehash = false; /* don't rehash on error */
794 dn = realdn; /* note realdn contains the error */
795 goto out;
796 } else if (realdn) {
797 dout("dn %p (%d) spliced with %p (%d) "
798 "inode %p ino %llx.%llx\n",
799 dn, atomic_read(&dn->d_count),
800 realdn, atomic_read(&realdn->d_count),
801 realdn->d_inode, ceph_vinop(realdn->d_inode));
802 dput(dn);
803 dn = realdn;
804 } else {
805 BUG_ON(!ceph_dentry(dn));
806
807 dout("dn %p attached to %p ino %llx.%llx\n",
808 dn, dn->d_inode, ceph_vinop(dn->d_inode));
809 }
810 if ((!prehash || *prehash) && d_unhashed(dn))
811 d_rehash(dn);
812out:
813 return dn;
814}
815
816/*
817 * Incorporate results into the local cache. This is either just
818 * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
819 * after a lookup).
820 *
821 * A reply may contain
822 * a directory inode along with a dentry.
823 * and/or a target inode
824 *
825 * Called with snap_rwsem (read).
826 */
827int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
828 struct ceph_mds_session *session)
829{
830 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
831 struct inode *in = NULL;
832 struct ceph_mds_reply_inode *ininfo;
833 struct ceph_vino vino;
834 int i = 0;
835 int err = 0;
836
837 dout("fill_trace %p is_dentry %d is_target %d\n", req,
838 rinfo->head->is_dentry, rinfo->head->is_target);
839
840#if 0
841 /*
842 * Debugging hook:
843 *
844 * If we resend completed ops to a recovering mds, we get no
845 * trace. Since that is very rare, pretend this is the case
846 * to ensure the 'no trace' handlers in the callers behave.
847 *
848 * Fill in inodes unconditionally to avoid breaking cap
849 * invariants.
850 */
851 if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
852 pr_info("fill_trace faking empty trace on %lld %s\n",
853 req->r_tid, ceph_mds_op_name(rinfo->head->op));
854 if (rinfo->head->is_dentry) {
855 rinfo->head->is_dentry = 0;
856 err = fill_inode(req->r_locked_dir,
857 &rinfo->diri, rinfo->dirfrag,
858 session, req->r_request_started, -1);
859 }
860 if (rinfo->head->is_target) {
861 rinfo->head->is_target = 0;
862 ininfo = rinfo->targeti.in;
863 vino.ino = le64_to_cpu(ininfo->ino);
864 vino.snap = le64_to_cpu(ininfo->snapid);
865 in = ceph_get_inode(sb, vino);
866 err = fill_inode(in, &rinfo->targeti, NULL,
867 session, req->r_request_started,
868 req->r_fmode);
869 iput(in);
870 }
871 }
872#endif
873
874 if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
875 dout("fill_trace reply is empty!\n");
876 if (rinfo->head->result == 0 && req->r_locked_dir) {
877 struct ceph_inode_info *ci =
878 ceph_inode(req->r_locked_dir);
879 dout(" clearing %p complete (empty trace)\n",
880 req->r_locked_dir);
881 ci->i_ceph_flags &= ~CEPH_I_COMPLETE;
882 ci->i_release_count++;
883 }
884 return 0;
885 }
886
887 if (rinfo->head->is_dentry) {
888 /*
889 * lookup link rename : null -> possibly existing inode
890 * mknod symlink mkdir : null -> new inode
891 * unlink : linked -> null
892 */
893 struct inode *dir = req->r_locked_dir;
894 struct dentry *dn = req->r_dentry;
895 bool have_dir_cap, have_lease;
896
897 BUG_ON(!dn);
898 BUG_ON(!dir);
899 BUG_ON(dn->d_parent->d_inode != dir);
900 BUG_ON(ceph_ino(dir) !=
901 le64_to_cpu(rinfo->diri.in->ino));
902 BUG_ON(ceph_snap(dir) !=
903 le64_to_cpu(rinfo->diri.in->snapid));
904
905 err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
906 session, req->r_request_started, -1,
907 &req->r_caps_reservation);
908 if (err < 0)
909 return err;
910
911 /* do we have a lease on the whole dir? */
912 have_dir_cap =
913 (le32_to_cpu(rinfo->diri.in->cap.caps) &
914 CEPH_CAP_FILE_SHARED);
915
916 /* do we have a dn lease? */
917 have_lease = have_dir_cap ||
918 (le16_to_cpu(rinfo->dlease->mask) &
919 CEPH_LOCK_DN);
920
921 if (!have_lease)
922 dout("fill_trace no dentry lease or dir cap\n");
923
924 /* rename? */
925 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
926 dout(" src %p '%.*s' dst %p '%.*s'\n",
927 req->r_old_dentry,
928 req->r_old_dentry->d_name.len,
929 req->r_old_dentry->d_name.name,
930 dn, dn->d_name.len, dn->d_name.name);
931 dout("fill_trace doing d_move %p -> %p\n",
932 req->r_old_dentry, dn);
933 d_move(req->r_old_dentry, dn);
934 dout(" src %p '%.*s' dst %p '%.*s'\n",
935 req->r_old_dentry,
936 req->r_old_dentry->d_name.len,
937 req->r_old_dentry->d_name.name,
938 dn, dn->d_name.len, dn->d_name.name);
939 /* take overwritten dentry's readdir offset */
940 ceph_dentry(req->r_old_dentry)->offset =
941 ceph_dentry(dn)->offset;
942 dn = req->r_old_dentry; /* use old_dentry */
943 in = dn->d_inode;
944 }
945
946 /* null dentry? */
947 if (!rinfo->head->is_target) {
948 dout("fill_trace null dentry\n");
949 if (dn->d_inode) {
950 dout("d_delete %p\n", dn);
951 d_delete(dn);
952 } else {
953 dout("d_instantiate %p NULL\n", dn);
954 d_instantiate(dn, NULL);
955 if (have_lease && d_unhashed(dn))
956 d_rehash(dn);
957 update_dentry_lease(dn, rinfo->dlease,
958 session,
959 req->r_request_started);
960 }
961 goto done;
962 }
963
964 /* attach proper inode */
965 ininfo = rinfo->targeti.in;
966 vino.ino = le64_to_cpu(ininfo->ino);
967 vino.snap = le64_to_cpu(ininfo->snapid);
968 if (!dn->d_inode) {
969 in = ceph_get_inode(sb, vino);
970 if (IS_ERR(in)) {
971 pr_err("fill_trace bad get_inode "
972 "%llx.%llx\n", vino.ino, vino.snap);
973 err = PTR_ERR(in);
974 d_delete(dn);
975 goto done;
976 }
977 dn = splice_dentry(dn, in, &have_lease);
978 if (IS_ERR(dn)) {
979 err = PTR_ERR(dn);
980 goto done;
981 }
982 req->r_dentry = dn; /* may have spliced */
983 igrab(in);
984 } else if (ceph_ino(in) == vino.ino &&
985 ceph_snap(in) == vino.snap) {
986 igrab(in);
987 } else {
988 dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
989 dn, in, ceph_ino(in), ceph_snap(in),
990 vino.ino, vino.snap);
991 have_lease = false;
992 in = NULL;
993 }
994
995 if (have_lease)
996 update_dentry_lease(dn, rinfo->dlease, session,
997 req->r_request_started);
998 dout(" final dn %p\n", dn);
999 i++;
1000 } else if (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1001 req->r_op == CEPH_MDS_OP_MKSNAP) {
1002 struct dentry *dn = req->r_dentry;
1003
1004 /* fill out a snapdir LOOKUPSNAP dentry */
1005 BUG_ON(!dn);
1006 BUG_ON(!req->r_locked_dir);
1007 BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR);
1008 ininfo = rinfo->targeti.in;
1009 vino.ino = le64_to_cpu(ininfo->ino);
1010 vino.snap = le64_to_cpu(ininfo->snapid);
1011 in = ceph_get_inode(sb, vino);
1012 if (IS_ERR(in)) {
1013 pr_err("fill_inode get_inode badness %llx.%llx\n",
1014 vino.ino, vino.snap);
1015 err = PTR_ERR(in);
1016 d_delete(dn);
1017 goto done;
1018 }
1019 dout(" linking snapped dir %p to dn %p\n", in, dn);
1020 dn = splice_dentry(dn, in, NULL);
1021 if (IS_ERR(dn)) {
1022 err = PTR_ERR(dn);
1023 goto done;
1024 }
1025 req->r_dentry = dn; /* may have spliced */
1026 igrab(in);
1027 rinfo->head->is_dentry = 1; /* fool notrace handlers */
1028 }
1029
1030 if (rinfo->head->is_target) {
1031 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1032 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1033
1034 if (in == NULL || ceph_ino(in) != vino.ino ||
1035 ceph_snap(in) != vino.snap) {
1036 in = ceph_get_inode(sb, vino);
1037 if (IS_ERR(in)) {
1038 err = PTR_ERR(in);
1039 goto done;
1040 }
1041 }
1042 req->r_target_inode = in;
1043
1044 err = fill_inode(in,
1045 &rinfo->targeti, NULL,
1046 session, req->r_request_started,
1047 (le32_to_cpu(rinfo->head->result) == 0) ?
1048 req->r_fmode : -1,
1049 &req->r_caps_reservation);
1050 if (err < 0) {
1051 pr_err("fill_inode badness %p %llx.%llx\n",
1052 in, ceph_vinop(in));
1053 goto done;
1054 }
1055 }
1056
1057done:
1058 dout("fill_trace done err=%d\n", err);
1059 return err;
1060}
1061
1062/*
1063 * Prepopulate our cache with readdir results, leases, etc.
1064 */
1065int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1066 struct ceph_mds_session *session)
1067{
1068 struct dentry *parent = req->r_dentry;
1069 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1070 struct qstr dname;
1071 struct dentry *dn;
1072 struct inode *in;
1073 int err = 0, i;
1074 struct inode *snapdir = NULL;
1075 struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1076 u64 frag = le32_to_cpu(rhead->args.readdir.frag);
1077 struct ceph_dentry_info *di;
1078
1079 if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1080 snapdir = ceph_get_snapdir(parent->d_inode);
1081 parent = d_find_alias(snapdir);
1082 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1083 rinfo->dir_nr, parent);
1084 } else {
1085 dout("readdir_prepopulate %d items under dn %p\n",
1086 rinfo->dir_nr, parent);
1087 if (rinfo->dir_dir)
1088 ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
1089 }
1090
1091 for (i = 0; i < rinfo->dir_nr; i++) {
1092 struct ceph_vino vino;
1093
1094 dname.name = rinfo->dir_dname[i];
1095 dname.len = rinfo->dir_dname_len[i];
1096 dname.hash = full_name_hash(dname.name, dname.len);
1097
1098 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1099 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1100
1101retry_lookup:
1102 dn = d_lookup(parent, &dname);
1103 dout("d_lookup on parent=%p name=%.*s got %p\n",
1104 parent, dname.len, dname.name, dn);
1105
1106 if (!dn) {
1107 dn = d_alloc(parent, &dname);
1108 dout("d_alloc %p '%.*s' = %p\n", parent,
1109 dname.len, dname.name, dn);
1110 if (dn == NULL) {
1111 dout("d_alloc badness\n");
1112 err = -ENOMEM;
1113 goto out;
1114 }
1115 err = ceph_init_dentry(dn);
1116 if (err < 0)
1117 goto out;
1118 } else if (dn->d_inode &&
1119 (ceph_ino(dn->d_inode) != vino.ino ||
1120 ceph_snap(dn->d_inode) != vino.snap)) {
1121 dout(" dn %p points to wrong inode %p\n",
1122 dn, dn->d_inode);
1123 d_delete(dn);
1124 dput(dn);
1125 goto retry_lookup;
1126 } else {
1127 /* reorder parent's d_subdirs */
1128 spin_lock(&dcache_lock);
1129 spin_lock(&dn->d_lock);
1130 list_move(&dn->d_u.d_child, &parent->d_subdirs);
1131 spin_unlock(&dn->d_lock);
1132 spin_unlock(&dcache_lock);
1133 }
1134
1135 di = dn->d_fsdata;
1136 di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset);
1137
1138 /* inode */
1139 if (dn->d_inode) {
1140 in = dn->d_inode;
1141 } else {
1142 in = ceph_get_inode(parent->d_sb, vino);
1143 if (in == NULL) {
1144 dout("new_inode badness\n");
1145 d_delete(dn);
1146 dput(dn);
1147 err = -ENOMEM;
1148 goto out;
1149 }
1150 dn = splice_dentry(dn, in, NULL);
1151 }
1152
1153 if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
1154 req->r_request_started, -1,
1155 &req->r_caps_reservation) < 0) {
1156 pr_err("fill_inode badness on %p\n", in);
1157 dput(dn);
1158 continue;
1159 }
1160 update_dentry_lease(dn, rinfo->dir_dlease[i],
1161 req->r_session, req->r_request_started);
1162 dput(dn);
1163 }
1164 req->r_did_prepopulate = true;
1165
1166out:
1167 if (snapdir) {
1168 iput(snapdir);
1169 dput(parent);
1170 }
1171 dout("readdir_prepopulate done\n");
1172 return err;
1173}
1174
1175int ceph_inode_set_size(struct inode *inode, loff_t size)
1176{
1177 struct ceph_inode_info *ci = ceph_inode(inode);
1178 int ret = 0;
1179
1180 spin_lock(&inode->i_lock);
1181 dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1182 inode->i_size = size;
1183 inode->i_blocks = (size + (1 << 9) - 1) >> 9;
1184
1185 /* tell the MDS if we are approaching max_size */
1186 if ((size << 1) >= ci->i_max_size &&
1187 (ci->i_reported_size << 1) < ci->i_max_size)
1188 ret = 1;
1189
1190 spin_unlock(&inode->i_lock);
1191 return ret;
1192}
1193
1194/*
1195 * Write back inode data in a worker thread. (This can't be done
1196 * in the message handler context.)
1197 */
1198void ceph_inode_writeback(struct work_struct *work)
1199{
1200 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1201 i_wb_work);
1202 struct inode *inode = &ci->vfs_inode;
1203
1204 dout("writeback %p\n", inode);
1205 filemap_fdatawrite(&inode->i_data);
1206 iput(inode);
1207}
1208
1209/*
1210 * Invalidate inode pages in a worker thread. (This can't be done
1211 * in the message handler context.)
1212 */
1213static void ceph_inode_invalidate_pages(struct work_struct *work)
1214{
1215 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1216 i_pg_inv_work);
1217 struct inode *inode = &ci->vfs_inode;
1218 u32 orig_gen;
1219 int check = 0;
1220
1221 spin_lock(&inode->i_lock);
1222 dout("invalidate_pages %p gen %d revoking %d\n", inode,
1223 ci->i_rdcache_gen, ci->i_rdcache_revoking);
1224 if (ci->i_rdcache_gen == 0 ||
1225 ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1226 BUG_ON(ci->i_rdcache_revoking > ci->i_rdcache_gen);
1227 /* nevermind! */
1228 ci->i_rdcache_revoking = 0;
1229 spin_unlock(&inode->i_lock);
1230 goto out;
1231 }
1232 orig_gen = ci->i_rdcache_gen;
1233 spin_unlock(&inode->i_lock);
1234
1235 truncate_inode_pages(&inode->i_data, 0);
1236
1237 spin_lock(&inode->i_lock);
1238 if (orig_gen == ci->i_rdcache_gen) {
1239 dout("invalidate_pages %p gen %d successful\n", inode,
1240 ci->i_rdcache_gen);
1241 ci->i_rdcache_gen = 0;
1242 ci->i_rdcache_revoking = 0;
1243 check = 1;
1244 } else {
1245 dout("invalidate_pages %p gen %d raced, gen now %d\n",
1246 inode, orig_gen, ci->i_rdcache_gen);
1247 }
1248 spin_unlock(&inode->i_lock);
1249
1250 if (check)
1251 ceph_check_caps(ci, 0, NULL);
1252out:
1253 iput(inode);
1254}
1255
1256
1257/*
1258 * called by trunc_wq; take i_mutex ourselves
1259 *
1260 * We also truncate in a separate thread as well.
1261 */
1262void ceph_vmtruncate_work(struct work_struct *work)
1263{
1264 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1265 i_vmtruncate_work);
1266 struct inode *inode = &ci->vfs_inode;
1267
1268 dout("vmtruncate_work %p\n", inode);
1269 mutex_lock(&inode->i_mutex);
1270 __ceph_do_pending_vmtruncate(inode);
1271 mutex_unlock(&inode->i_mutex);
1272 iput(inode);
1273}
1274
1275/*
1276 * called with i_mutex held.
1277 *
1278 * Make sure any pending truncation is applied before doing anything
1279 * that may depend on it.
1280 */
1281void __ceph_do_pending_vmtruncate(struct inode *inode)
1282{
1283 struct ceph_inode_info *ci = ceph_inode(inode);
1284 u64 to;
1285 int wrbuffer_refs, wake = 0;
1286
1287retry:
1288 spin_lock(&inode->i_lock);
1289 if (ci->i_truncate_pending == 0) {
1290 dout("__do_pending_vmtruncate %p none pending\n", inode);
1291 spin_unlock(&inode->i_lock);
1292 return;
1293 }
1294
1295 /*
1296 * make sure any dirty snapped pages are flushed before we
1297 * possibly truncate them.. so write AND block!
1298 */
1299 if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1300 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1301 inode);
1302 spin_unlock(&inode->i_lock);
1303 filemap_write_and_wait_range(&inode->i_data, 0,
1304 inode->i_sb->s_maxbytes);
1305 goto retry;
1306 }
1307
1308 to = ci->i_truncate_size;
1309 wrbuffer_refs = ci->i_wrbuffer_ref;
1310 dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1311 ci->i_truncate_pending, to);
1312 spin_unlock(&inode->i_lock);
1313
1314 truncate_inode_pages(inode->i_mapping, to);
1315
1316 spin_lock(&inode->i_lock);
1317 ci->i_truncate_pending--;
1318 if (ci->i_truncate_pending == 0)
1319 wake = 1;
1320 spin_unlock(&inode->i_lock);
1321
1322 if (wrbuffer_refs == 0)
1323 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1324 if (wake)
1325 wake_up(&ci->i_cap_wq);
1326}
1327
1328
1329/*
1330 * symlinks
1331 */
1332static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd)
1333{
1334 struct ceph_inode_info *ci = ceph_inode(dentry->d_inode);
1335 nd_set_link(nd, ci->i_symlink);
1336 return NULL;
1337}
1338
1339static const struct inode_operations ceph_symlink_iops = {
1340 .readlink = generic_readlink,
1341 .follow_link = ceph_sym_follow_link,
1342};
1343
1344/*
1345 * setattr
1346 */
1347int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1348{
1349 struct inode *inode = dentry->d_inode;
1350 struct ceph_inode_info *ci = ceph_inode(inode);
1351 struct inode *parent_inode = dentry->d_parent->d_inode;
1352 const unsigned int ia_valid = attr->ia_valid;
1353 struct ceph_mds_request *req;
1354 struct ceph_mds_client *mdsc = &ceph_client(dentry->d_sb)->mdsc;
1355 int issued;
1356 int release = 0, dirtied = 0;
1357 int mask = 0;
1358 int err = 0;
1359 int queue_trunc = 0;
1360
1361 if (ceph_snap(inode) != CEPH_NOSNAP)
1362 return -EROFS;
1363
1364 __ceph_do_pending_vmtruncate(inode);
1365
1366 err = inode_change_ok(inode, attr);
1367 if (err != 0)
1368 return err;
1369
1370 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1371 USE_AUTH_MDS);
1372 if (IS_ERR(req))
1373 return PTR_ERR(req);
1374
1375 spin_lock(&inode->i_lock);
1376 issued = __ceph_caps_issued(ci, NULL);
1377 dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1378
1379 if (ia_valid & ATTR_UID) {
1380 dout("setattr %p uid %d -> %d\n", inode,
1381 inode->i_uid, attr->ia_uid);
1382 if (issued & CEPH_CAP_AUTH_EXCL) {
1383 inode->i_uid = attr->ia_uid;
1384 dirtied |= CEPH_CAP_AUTH_EXCL;
1385 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1386 attr->ia_uid != inode->i_uid) {
1387 req->r_args.setattr.uid = cpu_to_le32(attr->ia_uid);
1388 mask |= CEPH_SETATTR_UID;
1389 release |= CEPH_CAP_AUTH_SHARED;
1390 }
1391 }
1392 if (ia_valid & ATTR_GID) {
1393 dout("setattr %p gid %d -> %d\n", inode,
1394 inode->i_gid, attr->ia_gid);
1395 if (issued & CEPH_CAP_AUTH_EXCL) {
1396 inode->i_gid = attr->ia_gid;
1397 dirtied |= CEPH_CAP_AUTH_EXCL;
1398 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1399 attr->ia_gid != inode->i_gid) {
1400 req->r_args.setattr.gid = cpu_to_le32(attr->ia_gid);
1401 mask |= CEPH_SETATTR_GID;
1402 release |= CEPH_CAP_AUTH_SHARED;
1403 }
1404 }
1405 if (ia_valid & ATTR_MODE) {
1406 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1407 attr->ia_mode);
1408 if (issued & CEPH_CAP_AUTH_EXCL) {
1409 inode->i_mode = attr->ia_mode;
1410 dirtied |= CEPH_CAP_AUTH_EXCL;
1411 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1412 attr->ia_mode != inode->i_mode) {
1413 req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1414 mask |= CEPH_SETATTR_MODE;
1415 release |= CEPH_CAP_AUTH_SHARED;
1416 }
1417 }
1418
1419 if (ia_valid & ATTR_ATIME) {
1420 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1421 inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1422 attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1423 if (issued & CEPH_CAP_FILE_EXCL) {
1424 ci->i_time_warp_seq++;
1425 inode->i_atime = attr->ia_atime;
1426 dirtied |= CEPH_CAP_FILE_EXCL;
1427 } else if ((issued & CEPH_CAP_FILE_WR) &&
1428 timespec_compare(&inode->i_atime,
1429 &attr->ia_atime) < 0) {
1430 inode->i_atime = attr->ia_atime;
1431 dirtied |= CEPH_CAP_FILE_WR;
1432 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1433 !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1434 ceph_encode_timespec(&req->r_args.setattr.atime,
1435 &attr->ia_atime);
1436 mask |= CEPH_SETATTR_ATIME;
1437 release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1438 CEPH_CAP_FILE_WR;
1439 }
1440 }
1441 if (ia_valid & ATTR_MTIME) {
1442 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1443 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1444 attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1445 if (issued & CEPH_CAP_FILE_EXCL) {
1446 ci->i_time_warp_seq++;
1447 inode->i_mtime = attr->ia_mtime;
1448 dirtied |= CEPH_CAP_FILE_EXCL;
1449 } else if ((issued & CEPH_CAP_FILE_WR) &&
1450 timespec_compare(&inode->i_mtime,
1451 &attr->ia_mtime) < 0) {
1452 inode->i_mtime = attr->ia_mtime;
1453 dirtied |= CEPH_CAP_FILE_WR;
1454 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1455 !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1456 ceph_encode_timespec(&req->r_args.setattr.mtime,
1457 &attr->ia_mtime);
1458 mask |= CEPH_SETATTR_MTIME;
1459 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1460 CEPH_CAP_FILE_WR;
1461 }
1462 }
1463 if (ia_valid & ATTR_SIZE) {
1464 dout("setattr %p size %lld -> %lld\n", inode,
1465 inode->i_size, attr->ia_size);
1466 if (attr->ia_size > inode->i_sb->s_maxbytes) {
1467 err = -EINVAL;
1468 goto out;
1469 }
1470 if ((issued & CEPH_CAP_FILE_EXCL) &&
1471 attr->ia_size > inode->i_size) {
1472 inode->i_size = attr->ia_size;
1473 if (attr->ia_size < inode->i_size) {
1474 ci->i_truncate_size = attr->ia_size;
1475 ci->i_truncate_pending++;
1476 queue_trunc = 1;
1477 }
1478 inode->i_blocks =
1479 (attr->ia_size + (1 << 9) - 1) >> 9;
1480 inode->i_ctime = attr->ia_ctime;
1481 ci->i_reported_size = attr->ia_size;
1482 dirtied |= CEPH_CAP_FILE_EXCL;
1483 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1484 attr->ia_size != inode->i_size) {
1485 req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1486 req->r_args.setattr.old_size =
1487 cpu_to_le64(inode->i_size);
1488 mask |= CEPH_SETATTR_SIZE;
1489 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1490 CEPH_CAP_FILE_WR;
1491 }
1492 }
1493
1494 /* these do nothing */
1495 if (ia_valid & ATTR_CTIME) {
1496 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1497 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1498 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1499 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1500 attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1501 only ? "ctime only" : "ignored");
1502 inode->i_ctime = attr->ia_ctime;
1503 if (only) {
1504 /*
1505 * if kernel wants to dirty ctime but nothing else,
1506 * we need to choose a cap to dirty under, or do
1507 * a almost-no-op setattr
1508 */
1509 if (issued & CEPH_CAP_AUTH_EXCL)
1510 dirtied |= CEPH_CAP_AUTH_EXCL;
1511 else if (issued & CEPH_CAP_FILE_EXCL)
1512 dirtied |= CEPH_CAP_FILE_EXCL;
1513 else if (issued & CEPH_CAP_XATTR_EXCL)
1514 dirtied |= CEPH_CAP_XATTR_EXCL;
1515 else
1516 mask |= CEPH_SETATTR_CTIME;
1517 }
1518 }
1519 if (ia_valid & ATTR_FILE)
1520 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1521
1522 if (dirtied) {
1523 __ceph_mark_dirty_caps(ci, dirtied);
1524 inode->i_ctime = CURRENT_TIME;
1525 }
1526
1527 release &= issued;
1528 spin_unlock(&inode->i_lock);
1529
1530 if (queue_trunc)
1531 __ceph_do_pending_vmtruncate(inode);
1532
1533 if (mask) {
1534 req->r_inode = igrab(inode);
1535 req->r_inode_drop = release;
1536 req->r_args.setattr.mask = cpu_to_le32(mask);
1537 req->r_num_caps = 1;
1538 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
1539 }
1540 dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1541 ceph_cap_string(dirtied), mask);
1542
1543 ceph_mdsc_put_request(req);
1544 __ceph_do_pending_vmtruncate(inode);
1545 return err;
1546out:
1547 spin_unlock(&inode->i_lock);
1548 ceph_mdsc_put_request(req);
1549 return err;
1550}
1551
1552/*
1553 * Verify that we have a lease on the given mask. If not,
1554 * do a getattr against an mds.
1555 */
1556int ceph_do_getattr(struct inode *inode, int mask)
1557{
1558 struct ceph_client *client = ceph_sb_to_client(inode->i_sb);
1559 struct ceph_mds_client *mdsc = &client->mdsc;
1560 struct ceph_mds_request *req;
1561 int err;
1562
1563 if (ceph_snap(inode) == CEPH_SNAPDIR) {
1564 dout("do_getattr inode %p SNAPDIR\n", inode);
1565 return 0;
1566 }
1567
1568 dout("do_getattr inode %p mask %s\n", inode, ceph_cap_string(mask));
1569 if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
1570 return 0;
1571
1572 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1573 if (IS_ERR(req))
1574 return PTR_ERR(req);
1575 req->r_inode = igrab(inode);
1576 req->r_num_caps = 1;
1577 req->r_args.getattr.mask = cpu_to_le32(mask);
1578 err = ceph_mdsc_do_request(mdsc, NULL, req);
1579 ceph_mdsc_put_request(req);
1580 dout("do_getattr result=%d\n", err);
1581 return err;
1582}
1583
1584
1585/*
1586 * Check inode permissions. We verify we have a valid value for
1587 * the AUTH cap, then call the generic handler.
1588 */
1589int ceph_permission(struct inode *inode, int mask)
1590{
1591 int err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED);
1592
1593 if (!err)
1594 err = generic_permission(inode, mask, NULL);
1595 return err;
1596}
1597
1598/*
1599 * Get all attributes. Hopefully somedata we'll have a statlite()
1600 * and can limit the fields we require to be accurate.
1601 */
1602int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
1603 struct kstat *stat)
1604{
1605 struct inode *inode = dentry->d_inode;
1606 int err;
1607
1608 err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL);
1609 if (!err) {
1610 generic_fillattr(inode, stat);
1611 stat->ino = inode->i_ino;
1612 if (ceph_snap(inode) != CEPH_NOSNAP)
1613 stat->dev = ceph_snap(inode);
1614 else
1615 stat->dev = 0;
1616 if (S_ISDIR(inode->i_mode))
1617 stat->blksize = 65536;
1618 }
1619 return err;
1620}
diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c
new file mode 100644
index 000000000000..8eaac04d1b87
--- /dev/null
+++ b/fs/ceph/xattr.c
@@ -0,0 +1,833 @@
1#include "ceph_debug.h"
2#include "super.h"
3#include "decode.h"
4
5#include <linux/xattr.h>
6
7static bool ceph_is_valid_xattr(const char *name)
8{
9 return !strncmp(name, XATTR_SECURITY_PREFIX,
10 XATTR_SECURITY_PREFIX_LEN) ||
11 !strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) ||
12 !strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
13}
14
15/*
16 * These define virtual xattrs exposing the recursive directory
17 * statistics and layout metadata.
18 */
19struct ceph_vxattr_cb {
20 bool readonly;
21 char *name;
22 size_t (*getxattr_cb)(struct ceph_inode_info *ci, char *val,
23 size_t size);
24};
25
26/* directories */
27
28static size_t ceph_vxattrcb_entries(struct ceph_inode_info *ci, char *val,
29 size_t size)
30{
31 return snprintf(val, size, "%lld", ci->i_files + ci->i_subdirs);
32}
33
34static size_t ceph_vxattrcb_files(struct ceph_inode_info *ci, char *val,
35 size_t size)
36{
37 return snprintf(val, size, "%lld", ci->i_files);
38}
39
40static size_t ceph_vxattrcb_subdirs(struct ceph_inode_info *ci, char *val,
41 size_t size)
42{
43 return snprintf(val, size, "%lld", ci->i_subdirs);
44}
45
46static size_t ceph_vxattrcb_rentries(struct ceph_inode_info *ci, char *val,
47 size_t size)
48{
49 return snprintf(val, size, "%lld", ci->i_rfiles + ci->i_rsubdirs);
50}
51
52static size_t ceph_vxattrcb_rfiles(struct ceph_inode_info *ci, char *val,
53 size_t size)
54{
55 return snprintf(val, size, "%lld", ci->i_rfiles);
56}
57
58static size_t ceph_vxattrcb_rsubdirs(struct ceph_inode_info *ci, char *val,
59 size_t size)
60{
61 return snprintf(val, size, "%lld", ci->i_rsubdirs);
62}
63
64static size_t ceph_vxattrcb_rbytes(struct ceph_inode_info *ci, char *val,
65 size_t size)
66{
67 return snprintf(val, size, "%lld", ci->i_rbytes);
68}
69
70static size_t ceph_vxattrcb_rctime(struct ceph_inode_info *ci, char *val,
71 size_t size)
72{
73 return snprintf(val, size, "%ld.%ld", (long)ci->i_rctime.tv_sec,
74 (long)ci->i_rctime.tv_nsec);
75}
76
77static struct ceph_vxattr_cb ceph_dir_vxattrs[] = {
78 { true, "user.ceph.dir.entries", ceph_vxattrcb_entries},
79 { true, "user.ceph.dir.files", ceph_vxattrcb_files},
80 { true, "user.ceph.dir.subdirs", ceph_vxattrcb_subdirs},
81 { true, "user.ceph.dir.rentries", ceph_vxattrcb_rentries},
82 { true, "user.ceph.dir.rfiles", ceph_vxattrcb_rfiles},
83 { true, "user.ceph.dir.rsubdirs", ceph_vxattrcb_rsubdirs},
84 { true, "user.ceph.dir.rbytes", ceph_vxattrcb_rbytes},
85 { true, "user.ceph.dir.rctime", ceph_vxattrcb_rctime},
86 { true, NULL, NULL }
87};
88
89/* files */
90
91static size_t ceph_vxattrcb_layout(struct ceph_inode_info *ci, char *val,
92 size_t size)
93{
94 return snprintf(val, size,
95 "chunk_bytes=%lld\nstripe_count=%lld\nobject_size=%lld\n",
96 (unsigned long long)ceph_file_layout_su(ci->i_layout),
97 (unsigned long long)ceph_file_layout_stripe_count(ci->i_layout),
98 (unsigned long long)ceph_file_layout_object_size(ci->i_layout));
99}
100
101static struct ceph_vxattr_cb ceph_file_vxattrs[] = {
102 { true, "user.ceph.layout", ceph_vxattrcb_layout},
103 { NULL, NULL }
104};
105
106static struct ceph_vxattr_cb *ceph_inode_vxattrs(struct inode *inode)
107{
108 if (S_ISDIR(inode->i_mode))
109 return ceph_dir_vxattrs;
110 else if (S_ISREG(inode->i_mode))
111 return ceph_file_vxattrs;
112 return NULL;
113}
114
115static struct ceph_vxattr_cb *ceph_match_vxattr(struct ceph_vxattr_cb *vxattr,
116 const char *name)
117{
118 do {
119 if (strcmp(vxattr->name, name) == 0)
120 return vxattr;
121 vxattr++;
122 } while (vxattr->name);
123 return NULL;
124}
125
126static int __set_xattr(struct ceph_inode_info *ci,
127 const char *name, int name_len,
128 const char *val, int val_len,
129 int dirty,
130 int should_free_name, int should_free_val,
131 struct ceph_inode_xattr **newxattr)
132{
133 struct rb_node **p;
134 struct rb_node *parent = NULL;
135 struct ceph_inode_xattr *xattr = NULL;
136 int c;
137 int new = 0;
138
139 p = &ci->i_xattrs.index.rb_node;
140 while (*p) {
141 parent = *p;
142 xattr = rb_entry(parent, struct ceph_inode_xattr, node);
143 c = strncmp(name, xattr->name, min(name_len, xattr->name_len));
144 if (c < 0)
145 p = &(*p)->rb_left;
146 else if (c > 0)
147 p = &(*p)->rb_right;
148 else {
149 if (name_len == xattr->name_len)
150 break;
151 else if (name_len < xattr->name_len)
152 p = &(*p)->rb_left;
153 else
154 p = &(*p)->rb_right;
155 }
156 xattr = NULL;
157 }
158
159 if (!xattr) {
160 new = 1;
161 xattr = *newxattr;
162 xattr->name = name;
163 xattr->name_len = name_len;
164 xattr->should_free_name = should_free_name;
165
166 ci->i_xattrs.count++;
167 dout("__set_xattr count=%d\n", ci->i_xattrs.count);
168 } else {
169 kfree(*newxattr);
170 *newxattr = NULL;
171 if (xattr->should_free_val)
172 kfree((void *)xattr->val);
173
174 if (should_free_name) {
175 kfree((void *)name);
176 name = xattr->name;
177 }
178 ci->i_xattrs.names_size -= xattr->name_len;
179 ci->i_xattrs.vals_size -= xattr->val_len;
180 }
181 if (!xattr) {
182 pr_err("__set_xattr ENOMEM on %p %llx.%llx xattr %s=%s\n",
183 &ci->vfs_inode, ceph_vinop(&ci->vfs_inode), name,
184 xattr->val);
185 return -ENOMEM;
186 }
187 ci->i_xattrs.names_size += name_len;
188 ci->i_xattrs.vals_size += val_len;
189 if (val)
190 xattr->val = val;
191 else
192 xattr->val = "";
193
194 xattr->val_len = val_len;
195 xattr->dirty = dirty;
196 xattr->should_free_val = (val && should_free_val);
197
198 if (new) {
199 rb_link_node(&xattr->node, parent, p);
200 rb_insert_color(&xattr->node, &ci->i_xattrs.index);
201 dout("__set_xattr_val p=%p\n", p);
202 }
203
204 dout("__set_xattr_val added %llx.%llx xattr %p %s=%.*s\n",
205 ceph_vinop(&ci->vfs_inode), xattr, name, val_len, val);
206
207 return 0;
208}
209
210static struct ceph_inode_xattr *__get_xattr(struct ceph_inode_info *ci,
211 const char *name)
212{
213 struct rb_node **p;
214 struct rb_node *parent = NULL;
215 struct ceph_inode_xattr *xattr = NULL;
216 int c;
217
218 p = &ci->i_xattrs.index.rb_node;
219 while (*p) {
220 parent = *p;
221 xattr = rb_entry(parent, struct ceph_inode_xattr, node);
222 c = strncmp(name, xattr->name, xattr->name_len);
223 if (c < 0)
224 p = &(*p)->rb_left;
225 else if (c > 0)
226 p = &(*p)->rb_right;
227 else {
228 dout("__get_xattr %s: found %.*s\n", name,
229 xattr->val_len, xattr->val);
230 return xattr;
231 }
232 }
233
234 dout("__get_xattr %s: not found\n", name);
235
236 return NULL;
237}
238
239static void __free_xattr(struct ceph_inode_xattr *xattr)
240{
241 BUG_ON(!xattr);
242
243 if (xattr->should_free_name)
244 kfree((void *)xattr->name);
245 if (xattr->should_free_val)
246 kfree((void *)xattr->val);
247
248 kfree(xattr);
249}
250
251static int __remove_xattr(struct ceph_inode_info *ci,
252 struct ceph_inode_xattr *xattr)
253{
254 if (!xattr)
255 return -EOPNOTSUPP;
256
257 rb_erase(&xattr->node, &ci->i_xattrs.index);
258
259 if (xattr->should_free_name)
260 kfree((void *)xattr->name);
261 if (xattr->should_free_val)
262 kfree((void *)xattr->val);
263
264 ci->i_xattrs.names_size -= xattr->name_len;
265 ci->i_xattrs.vals_size -= xattr->val_len;
266 ci->i_xattrs.count--;
267 kfree(xattr);
268
269 return 0;
270}
271
272static int __remove_xattr_by_name(struct ceph_inode_info *ci,
273 const char *name)
274{
275 struct rb_node **p;
276 struct ceph_inode_xattr *xattr;
277 int err;
278
279 p = &ci->i_xattrs.index.rb_node;
280 xattr = __get_xattr(ci, name);
281 err = __remove_xattr(ci, xattr);
282 return err;
283}
284
285static char *__copy_xattr_names(struct ceph_inode_info *ci,
286 char *dest)
287{
288 struct rb_node *p;
289 struct ceph_inode_xattr *xattr = NULL;
290
291 p = rb_first(&ci->i_xattrs.index);
292 dout("__copy_xattr_names count=%d\n", ci->i_xattrs.count);
293
294 while (p) {
295 xattr = rb_entry(p, struct ceph_inode_xattr, node);
296 memcpy(dest, xattr->name, xattr->name_len);
297 dest[xattr->name_len] = '\0';
298
299 dout("dest=%s %p (%s) (%d/%d)\n", dest, xattr, xattr->name,
300 xattr->name_len, ci->i_xattrs.names_size);
301
302 dest += xattr->name_len + 1;
303 p = rb_next(p);
304 }
305
306 return dest;
307}
308
309void __ceph_destroy_xattrs(struct ceph_inode_info *ci)
310{
311 struct rb_node *p, *tmp;
312 struct ceph_inode_xattr *xattr = NULL;
313
314 p = rb_first(&ci->i_xattrs.index);
315
316 dout("__ceph_destroy_xattrs p=%p\n", p);
317
318 while (p) {
319 xattr = rb_entry(p, struct ceph_inode_xattr, node);
320 tmp = p;
321 p = rb_next(tmp);
322 dout("__ceph_destroy_xattrs next p=%p (%.*s)\n", p,
323 xattr->name_len, xattr->name);
324 rb_erase(tmp, &ci->i_xattrs.index);
325
326 __free_xattr(xattr);
327 }
328
329 ci->i_xattrs.names_size = 0;
330 ci->i_xattrs.vals_size = 0;
331 ci->i_xattrs.index_version = 0;
332 ci->i_xattrs.count = 0;
333 ci->i_xattrs.index = RB_ROOT;
334}
335
336static int __build_xattrs(struct inode *inode)
337{
338 u32 namelen;
339 u32 numattr = 0;
340 void *p, *end;
341 u32 len;
342 const char *name, *val;
343 struct ceph_inode_info *ci = ceph_inode(inode);
344 int xattr_version;
345 struct ceph_inode_xattr **xattrs = NULL;
346 int err;
347 int i;
348
349 dout("__build_xattrs() len=%d\n",
350 ci->i_xattrs.blob ? (int)ci->i_xattrs.blob->vec.iov_len : 0);
351
352 if (ci->i_xattrs.index_version >= ci->i_xattrs.version)
353 return 0; /* already built */
354
355 __ceph_destroy_xattrs(ci);
356
357start:
358 /* updated internal xattr rb tree */
359 if (ci->i_xattrs.blob && ci->i_xattrs.blob->vec.iov_len > 4) {
360 p = ci->i_xattrs.blob->vec.iov_base;
361 end = p + ci->i_xattrs.blob->vec.iov_len;
362 ceph_decode_32_safe(&p, end, numattr, bad);
363 xattr_version = ci->i_xattrs.version;
364 spin_unlock(&inode->i_lock);
365
366 xattrs = kcalloc(numattr, sizeof(struct ceph_xattr *),
367 GFP_NOFS);
368 err = -ENOMEM;
369 if (!xattrs)
370 goto bad_lock;
371 memset(xattrs, 0, numattr*sizeof(struct ceph_xattr *));
372 for (i = 0; i < numattr; i++) {
373 xattrs[i] = kmalloc(sizeof(struct ceph_inode_xattr),
374 GFP_NOFS);
375 if (!xattrs[i])
376 goto bad_lock;
377 }
378
379 spin_lock(&inode->i_lock);
380 if (ci->i_xattrs.version != xattr_version) {
381 /* lost a race, retry */
382 for (i = 0; i < numattr; i++)
383 kfree(xattrs[i]);
384 kfree(xattrs);
385 goto start;
386 }
387 err = -EIO;
388 while (numattr--) {
389 ceph_decode_32_safe(&p, end, len, bad);
390 namelen = len;
391 name = p;
392 p += len;
393 ceph_decode_32_safe(&p, end, len, bad);
394 val = p;
395 p += len;
396
397 err = __set_xattr(ci, name, namelen, val, len,
398 0, 0, 0, &xattrs[numattr]);
399
400 if (err < 0)
401 goto bad;
402 }
403 kfree(xattrs);
404 }
405 ci->i_xattrs.index_version = ci->i_xattrs.version;
406 ci->i_xattrs.dirty = false;
407
408 return err;
409bad_lock:
410 spin_lock(&inode->i_lock);
411bad:
412 if (xattrs) {
413 for (i = 0; i < numattr; i++)
414 kfree(xattrs[i]);
415 kfree(xattrs);
416 }
417 ci->i_xattrs.names_size = 0;
418 return err;
419}
420
421static int __get_required_blob_size(struct ceph_inode_info *ci, int name_size,
422 int val_size)
423{
424 /*
425 * 4 bytes for the length, and additional 4 bytes per each xattr name,
426 * 4 bytes per each value
427 */
428 int size = 4 + ci->i_xattrs.count*(4 + 4) +
429 ci->i_xattrs.names_size +
430 ci->i_xattrs.vals_size;
431 dout("__get_required_blob_size c=%d names.size=%d vals.size=%d\n",
432 ci->i_xattrs.count, ci->i_xattrs.names_size,
433 ci->i_xattrs.vals_size);
434
435 if (name_size)
436 size += 4 + 4 + name_size + val_size;
437
438 return size;
439}
440
441/*
442 * If there are dirty xattrs, reencode xattrs into the prealloc_blob
443 * and swap into place.
444 */
445void __ceph_build_xattrs_blob(struct ceph_inode_info *ci)
446{
447 struct rb_node *p;
448 struct ceph_inode_xattr *xattr = NULL;
449 void *dest;
450
451 dout("__build_xattrs_blob %p\n", &ci->vfs_inode);
452 if (ci->i_xattrs.dirty) {
453 int need = __get_required_blob_size(ci, 0, 0);
454
455 BUG_ON(need > ci->i_xattrs.prealloc_blob->alloc_len);
456
457 p = rb_first(&ci->i_xattrs.index);
458 dest = ci->i_xattrs.prealloc_blob->vec.iov_base;
459
460 ceph_encode_32(&dest, ci->i_xattrs.count);
461 while (p) {
462 xattr = rb_entry(p, struct ceph_inode_xattr, node);
463
464 ceph_encode_32(&dest, xattr->name_len);
465 memcpy(dest, xattr->name, xattr->name_len);
466 dest += xattr->name_len;
467 ceph_encode_32(&dest, xattr->val_len);
468 memcpy(dest, xattr->val, xattr->val_len);
469 dest += xattr->val_len;
470
471 p = rb_next(p);
472 }
473
474 /* adjust buffer len; it may be larger than we need */
475 ci->i_xattrs.prealloc_blob->vec.iov_len =
476 dest - ci->i_xattrs.prealloc_blob->vec.iov_base;
477
478 ceph_buffer_put(ci->i_xattrs.blob);
479 ci->i_xattrs.blob = ci->i_xattrs.prealloc_blob;
480 ci->i_xattrs.prealloc_blob = NULL;
481 ci->i_xattrs.dirty = false;
482 }
483}
484
485ssize_t ceph_getxattr(struct dentry *dentry, const char *name, void *value,
486 size_t size)
487{
488 struct inode *inode = dentry->d_inode;
489 struct ceph_inode_info *ci = ceph_inode(inode);
490 struct ceph_vxattr_cb *vxattrs = ceph_inode_vxattrs(inode);
491 int err;
492 struct ceph_inode_xattr *xattr;
493 struct ceph_vxattr_cb *vxattr = NULL;
494
495 if (!ceph_is_valid_xattr(name))
496 return -ENODATA;
497
498 /* let's see if a virtual xattr was requested */
499 if (vxattrs)
500 vxattr = ceph_match_vxattr(vxattrs, name);
501
502 spin_lock(&inode->i_lock);
503 dout("getxattr %p ver=%lld index_ver=%lld\n", inode,
504 ci->i_xattrs.version, ci->i_xattrs.index_version);
505
506 if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1) &&
507 (ci->i_xattrs.index_version >= ci->i_xattrs.version)) {
508 goto get_xattr;
509 } else {
510 spin_unlock(&inode->i_lock);
511 /* get xattrs from mds (if we don't already have them) */
512 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR);
513 if (err)
514 return err;
515 }
516
517 spin_lock(&inode->i_lock);
518
519 if (vxattr && vxattr->readonly) {
520 err = vxattr->getxattr_cb(ci, value, size);
521 goto out;
522 }
523
524 err = __build_xattrs(inode);
525 if (err < 0)
526 goto out;
527
528get_xattr:
529 err = -ENODATA; /* == ENOATTR */
530 xattr = __get_xattr(ci, name);
531 if (!xattr) {
532 if (vxattr)
533 err = vxattr->getxattr_cb(ci, value, size);
534 goto out;
535 }
536
537 err = -ERANGE;
538 if (size && size < xattr->val_len)
539 goto out;
540
541 err = xattr->val_len;
542 if (size == 0)
543 goto out;
544
545 memcpy(value, xattr->val, xattr->val_len);
546
547out:
548 spin_unlock(&inode->i_lock);
549 return err;
550}
551
552ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size)
553{
554 struct inode *inode = dentry->d_inode;
555 struct ceph_inode_info *ci = ceph_inode(inode);
556 struct ceph_vxattr_cb *vxattrs = ceph_inode_vxattrs(inode);
557 u32 vir_namelen = 0;
558 u32 namelen;
559 int err;
560 u32 len;
561 int i;
562
563 spin_lock(&inode->i_lock);
564 dout("listxattr %p ver=%lld index_ver=%lld\n", inode,
565 ci->i_xattrs.version, ci->i_xattrs.index_version);
566
567 if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1) &&
568 (ci->i_xattrs.index_version > ci->i_xattrs.version)) {
569 goto list_xattr;
570 } else {
571 spin_unlock(&inode->i_lock);
572 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR);
573 if (err)
574 return err;
575 }
576
577 spin_lock(&inode->i_lock);
578
579 err = __build_xattrs(inode);
580 if (err < 0)
581 goto out;
582
583list_xattr:
584 vir_namelen = 0;
585 /* include virtual dir xattrs */
586 if (vxattrs)
587 for (i = 0; vxattrs[i].name; i++)
588 vir_namelen += strlen(vxattrs[i].name) + 1;
589 /* adding 1 byte per each variable due to the null termination */
590 namelen = vir_namelen + ci->i_xattrs.names_size + ci->i_xattrs.count;
591 err = -ERANGE;
592 if (size && namelen > size)
593 goto out;
594
595 err = namelen;
596 if (size == 0)
597 goto out;
598
599 names = __copy_xattr_names(ci, names);
600
601 /* virtual xattr names, too */
602 if (vxattrs)
603 for (i = 0; vxattrs[i].name; i++) {
604 len = sprintf(names, "%s", vxattrs[i].name);
605 names += len + 1;
606 }
607
608out:
609 spin_unlock(&inode->i_lock);
610 return err;
611}
612
613static int ceph_sync_setxattr(struct dentry *dentry, const char *name,
614 const char *value, size_t size, int flags)
615{
616 struct ceph_client *client = ceph_client(dentry->d_sb);
617 struct inode *inode = dentry->d_inode;
618 struct ceph_inode_info *ci = ceph_inode(inode);
619 struct inode *parent_inode = dentry->d_parent->d_inode;
620 struct ceph_mds_request *req;
621 struct ceph_mds_client *mdsc = &client->mdsc;
622 int err;
623 int i, nr_pages;
624 struct page **pages = NULL;
625 void *kaddr;
626
627 /* copy value into some pages */
628 nr_pages = calc_pages_for(0, size);
629 if (nr_pages) {
630 pages = kmalloc(sizeof(pages[0])*nr_pages, GFP_NOFS);
631 if (!pages)
632 return -ENOMEM;
633 err = -ENOMEM;
634 for (i = 0; i < nr_pages; i++) {
635 pages[i] = alloc_page(GFP_NOFS);
636 if (!pages[i]) {
637 nr_pages = i;
638 goto out;
639 }
640 kaddr = kmap(pages[i]);
641 memcpy(kaddr, value + i*PAGE_CACHE_SIZE,
642 min(PAGE_CACHE_SIZE, size-i*PAGE_CACHE_SIZE));
643 }
644 }
645
646 dout("setxattr value=%.*s\n", (int)size, value);
647
648 /* do request */
649 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETXATTR,
650 USE_AUTH_MDS);
651 if (IS_ERR(req))
652 return PTR_ERR(req);
653 req->r_inode = igrab(inode);
654 req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
655 req->r_num_caps = 1;
656 req->r_args.setxattr.flags = cpu_to_le32(flags);
657 req->r_path2 = kstrdup(name, GFP_NOFS);
658
659 req->r_pages = pages;
660 req->r_num_pages = nr_pages;
661 req->r_data_len = size;
662
663 dout("xattr.ver (before): %lld\n", ci->i_xattrs.version);
664 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
665 ceph_mdsc_put_request(req);
666 dout("xattr.ver (after): %lld\n", ci->i_xattrs.version);
667
668out:
669 if (pages) {
670 for (i = 0; i < nr_pages; i++)
671 __free_page(pages[i]);
672 kfree(pages);
673 }
674 return err;
675}
676
677int ceph_setxattr(struct dentry *dentry, const char *name,
678 const void *value, size_t size, int flags)
679{
680 struct inode *inode = dentry->d_inode;
681 struct ceph_inode_info *ci = ceph_inode(inode);
682 struct ceph_vxattr_cb *vxattrs = ceph_inode_vxattrs(inode);
683 int err;
684 int name_len = strlen(name);
685 int val_len = size;
686 char *newname = NULL;
687 char *newval = NULL;
688 struct ceph_inode_xattr *xattr = NULL;
689 int issued;
690 int required_blob_size;
691
692 if (ceph_snap(inode) != CEPH_NOSNAP)
693 return -EROFS;
694
695 if (!ceph_is_valid_xattr(name))
696 return -EOPNOTSUPP;
697
698 if (vxattrs) {
699 struct ceph_vxattr_cb *vxattr =
700 ceph_match_vxattr(vxattrs, name);
701 if (vxattr && vxattr->readonly)
702 return -EOPNOTSUPP;
703 }
704
705 /* preallocate memory for xattr name, value, index node */
706 err = -ENOMEM;
707 newname = kmalloc(name_len + 1, GFP_NOFS);
708 if (!newname)
709 goto out;
710 memcpy(newname, name, name_len + 1);
711
712 if (val_len) {
713 newval = kmalloc(val_len + 1, GFP_NOFS);
714 if (!newval)
715 goto out;
716 memcpy(newval, value, val_len);
717 newval[val_len] = '\0';
718 }
719
720 xattr = kmalloc(sizeof(struct ceph_inode_xattr), GFP_NOFS);
721 if (!xattr)
722 goto out;
723
724 spin_lock(&inode->i_lock);
725retry:
726 issued = __ceph_caps_issued(ci, NULL);
727 if (!(issued & CEPH_CAP_XATTR_EXCL))
728 goto do_sync;
729 __build_xattrs(inode);
730
731 required_blob_size = __get_required_blob_size(ci, name_len, val_len);
732
733 if (!ci->i_xattrs.prealloc_blob ||
734 required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) {
735 struct ceph_buffer *blob = NULL;
736
737 spin_unlock(&inode->i_lock);
738 dout(" preaallocating new blob size=%d\n", required_blob_size);
739 blob = ceph_buffer_new_alloc(required_blob_size, GFP_NOFS);
740 if (!blob)
741 goto out;
742 spin_lock(&inode->i_lock);
743 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
744 ci->i_xattrs.prealloc_blob = blob;
745 goto retry;
746 }
747
748 dout("setxattr %p issued %s\n", inode, ceph_cap_string(issued));
749 err = __set_xattr(ci, newname, name_len, newval,
750 val_len, 1, 1, 1, &xattr);
751 __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL);
752 ci->i_xattrs.dirty = true;
753 inode->i_ctime = CURRENT_TIME;
754 spin_unlock(&inode->i_lock);
755
756 return err;
757
758do_sync:
759 spin_unlock(&inode->i_lock);
760 err = ceph_sync_setxattr(dentry, name, value, size, flags);
761out:
762 kfree(newname);
763 kfree(newval);
764 kfree(xattr);
765 return err;
766}
767
768static int ceph_send_removexattr(struct dentry *dentry, const char *name)
769{
770 struct ceph_client *client = ceph_client(dentry->d_sb);
771 struct ceph_mds_client *mdsc = &client->mdsc;
772 struct inode *inode = dentry->d_inode;
773 struct inode *parent_inode = dentry->d_parent->d_inode;
774 struct ceph_mds_request *req;
775 int err;
776
777 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RMXATTR,
778 USE_AUTH_MDS);
779 if (IS_ERR(req))
780 return PTR_ERR(req);
781 req->r_inode = igrab(inode);
782 req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
783 req->r_num_caps = 1;
784 req->r_path2 = kstrdup(name, GFP_NOFS);
785
786 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
787 ceph_mdsc_put_request(req);
788 return err;
789}
790
791int ceph_removexattr(struct dentry *dentry, const char *name)
792{
793 struct inode *inode = dentry->d_inode;
794 struct ceph_inode_info *ci = ceph_inode(inode);
795 struct ceph_vxattr_cb *vxattrs = ceph_inode_vxattrs(inode);
796 int issued;
797 int err;
798
799 if (ceph_snap(inode) != CEPH_NOSNAP)
800 return -EROFS;
801
802 if (!ceph_is_valid_xattr(name))
803 return -EOPNOTSUPP;
804
805 if (vxattrs) {
806 struct ceph_vxattr_cb *vxattr =
807 ceph_match_vxattr(vxattrs, name);
808 if (vxattr && vxattr->readonly)
809 return -EOPNOTSUPP;
810 }
811
812 spin_lock(&inode->i_lock);
813 __build_xattrs(inode);
814 issued = __ceph_caps_issued(ci, NULL);
815 dout("removexattr %p issued %s\n", inode, ceph_cap_string(issued));
816
817 if (!(issued & CEPH_CAP_XATTR_EXCL))
818 goto do_sync;
819
820 err = __remove_xattr_by_name(ceph_inode(inode), name);
821 __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL);
822 ci->i_xattrs.dirty = true;
823 inode->i_ctime = CURRENT_TIME;
824
825 spin_unlock(&inode->i_lock);
826
827 return err;
828do_sync:
829 spin_unlock(&inode->i_lock);
830 err = ceph_send_removexattr(dentry, name);
831 return err;
832}
833
generated by cgit v1.2.2 (git 2.25.0) at 2025-04-15 04:38:55 -0400